Killer whale rubs belly on rocks

What dog doesn't like a nice relaxing belly rub? Apparently orcas, also known as killer whales, love them too.

They're not often caught in the act, but amateur photographer Chris Wilton was able to take this remarkable video of orcas rubbing their bellies on small stones on the shores of Canada's Vancouver Island.

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Killer whale rubs belly on rocks

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Killer whale rubs belly on rocks

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According to a scientist at the The Marine Detective, this behavior is unique to northern "resident" orcas. It is so rarely seen by humans, so it is difficult to study the whales and figure out why they do this.